MP4603 – WHITE LED DRIVER FOR LARGE LCD TV BACKLIGHTS

MP4603 Rev. 1.0

www.MonolithicPower.com

4

4/27/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2012 MPS. All Rights Reserved.MP4603

ELECTRICAL CHARACTERISTICS

noted.

Parameters

Symbol Condition

Min

Typ

Max

Units

FB Feedback Voltage

V

FB

190

200

210

mV

FB Input Current

I

FB

V

FB

= 0.2V

-0.1

0.1

μA

VIN UVLO Rising

V

VINTH

3.6

4

4.3

V

VIN UVLO Hysteresis

V

VINHYS

400

mV

Shut Down Current

I

off

V

EN

=0V

10

μA

Supply Current (Quiescent)

I

Q

V

PWM

= 0V,

V

FB

= 250mV

1.05

1.2

mA

Switch-On Resistance

(5)

0.5

Ω

Switch Leakage

I

SWLK

V

VIN

=80V, V

EN

=0V,

V

PWM

=0V, V

SW

=0V

1

μA

Switch Current Limit

(5)

I

S_MAX

2.5

A

Oscillator Frequency

f

SW

FST pin open

0.65

0.9

1.2

MHz

R

FST

= 200kΩ

180

280

390

kHz

FST Output Voltage

V

FST

1

1.1

1.2

V

Fold-back Frequency

f

SWFB

V

FB

= V

OVP

= 0V, FST pin

open

160

kHz

V

FB

= V

OVP

= 0V, R

FST

=

200kΩ

40

Slope Compensation

S

SLOPE

SLOPE pin open

0.3

0.5

0.7

V/μs

R

SLOPE

= 200kΩ

0.12

0.17

0.235

SLOPE Pin Output Voltage

V

SLOPE

1

1.1

1.2

V

Maximum Duty Cycle

D

MAX

V

FB

= 0.15V,FST pin open

88

%

Minimum ON-Time

(5)

t

ON

270

ns

SYN Input Current

I

SYN

V

SYN

= 3.3V

400

μA

V

SYN

= 0V

-750

Frequency Synchronization Range

(5)

f

SW SYN

0.1

2

MHz

PWM Dimming OFF Threshold

V

PWML

V

PWM

Falling

1.65

V

PWM Dimming ON Threshold

V

PWMH

V

PWM

Rising

2.2

V

PWM Dimming Frequency

100

50k

Hz

Minimum Analog Dimming Threshold

V

ADMIN

V

FB

= 5mV

0

mV

Maximum Analog Dimming Threshold

V

ADMAX

V

FB

= 200mV

1.2

V

ADIM Input Current

V

ADIM

= 3.3V

36

μA

V

ADIM

= 0V

-3.5

EN OFF Threshold

V

ENL

V

EN

Falling

0.9

V

EN ON Threshold

V

ENH

V

EN

Rising

1.5

V

EN Input Current

N

V

EN

= 3.3V

3.8

μA